drivers/acpi/pci_bind.c

   1 /*
   2  *  pci_bind.c - ACPI PCI Device Binding ($Revision: 2 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or (at
  12  *  your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/init.h>
  29 #include <linux/types.h>
  30 #include <linux/proc_fs.h>
  31 #include <linux/spinlock.h>
  32 #include <linux/pm.h>
  33 #include <linux/pci.h>
  34 #include <linux/acpi.h>
  35 #include <acpi/acpi_bus.h>
  36 #include <acpi/acpi_drivers.h>
  37
  38 #define _COMPONENT              ACPI_PCI_COMPONENT
  39 ACPI_MODULE_NAME("pci_bind");
  40
  41 struct acpi_pci_data {
  42         struct acpi_pci_id id;
  43         struct pci_bus *bus;
  44         struct pci_dev *dev;
  45 };
  46
  47 static int acpi_pci_unbind(struct acpi_device *device);
  48
  49 static void acpi_pci_data_handler(acpi_handle handle, u32 function,
  50                                   void *context)
  51 {
  52
  53         /* TBD: Anything we need to do here? */
  54
  55         return;
  56 }
  57
  58 /**
  59  * acpi_get_pci_id
  60  * ------------------
  61  * This function is used by the ACPI Interpreter (a.k.a. Core Subsystem)
  62  * to resolve PCI information for ACPI-PCI devices defined in the namespace.
  63  * This typically occurs when resolving PCI operation region information.
  64  */
  65 acpi_status acpi_get_pci_id(acpi_handle handle, struct acpi_pci_id *id)
  66 {
  67         int result = 0;
  68         acpi_status status = AE_OK;
  69         struct acpi_device *device = NULL;
  70         struct acpi_pci_data *data = NULL;
  71
  72
  73         if (!id)
  74                 return AE_BAD_PARAMETER;
  75
  76         result = acpi_bus_get_device(handle, &device);
  77         if (result) {
  78                 printk(KERN_ERR PREFIX
  79                             "Invalid ACPI Bus context for device %s\n",
  80                             acpi_device_bid(device));
  81                 return AE_NOT_EXIST;
  82         }
  83
  84         status = acpi_get_data(handle, acpi_pci_data_handler, (void **)&data);
  85         if (ACPI_FAILURE(status) || !data) {
  86                 ACPI_EXCEPTION((AE_INFO, status,
  87                                 "Invalid ACPI-PCI context for device %s",
  88                                 acpi_device_bid(device)));
  89                 return status;
  90         }
  91
  92         *id = data->id;
  93
  94         /*
  95            id->segment = data->id.segment;
  96            id->bus = data->id.bus;
  97            id->device = data->id.device;
  98            id->function = data->id.function;
  99          */
 100
 101         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 102                           "Device %s has PCI address %02x:%02x:%02x.%02x\n",
 103                           acpi_device_bid(device), id->segment, id->bus,
 104                           id->device, id->function));
 105
 106         return AE_OK;
 107 }
 108
 109 EXPORT_SYMBOL(acpi_get_pci_id);
 110
 111 int acpi_pci_bind(struct acpi_device *device)
 112 {
 113         int result = 0;
 114         acpi_status status = AE_OK;
 115         struct acpi_pci_data *data = NULL;
 116         struct acpi_pci_data *pdata = NULL;
 117         char *pathname = NULL;
 118         struct acpi_buffer buffer = { 0, NULL };
 119         acpi_handle handle = NULL;
 120         struct pci_dev *dev;
 121         struct pci_bus *bus;
 122
 123
 124         if (!device || !device->parent)
 125                 return -EINVAL;
 126
 127         pathname = kzalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
 128         if (!pathname)
 129                 return -ENOMEM;
 130         buffer.length = ACPI_PATHNAME_MAX;
 131         buffer.pointer = pathname;
 132
 133         data = kzalloc(sizeof(struct acpi_pci_data), GFP_KERNEL);
 134         if (!data) {
 135                 kfree(pathname);
 136                 return -ENOMEM;
 137         }
 138
 139         acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
 140         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Binding PCI device [%s]...\n",
 141                           pathname));
 142
 143         /*
 144          * Segment & Bus
 145          * -------------
 146          * These are obtained via the parent device's ACPI-PCI context.
 147          */
 148         status = acpi_get_data(device->parent->handle, acpi_pci_data_handler,
 149                                (void **)&pdata);
 150         if (ACPI_FAILURE(status) || !pdata || !pdata->bus) {
 151                 ACPI_EXCEPTION((AE_INFO, status,
 152                                 "Invalid ACPI-PCI context for parent device %s",
 153                                 acpi_device_bid(device->parent)));
 154                 result = -ENODEV;
 155                 goto end;
 156         }
 157         data->id.segment = pdata->id.segment;
 158         data->id.bus = pdata->bus->number;
 159
 160         /*
 161          * Device & Function
 162          * -----------------
 163          * These are simply obtained from the device's _ADR method.  Note
 164          * that a value of zero is valid.
 165          */
 166         data->id.device = device->pnp.bus_address >> 16;
 167         data->id.function = device->pnp.bus_address & 0xFFFF;
 168
 169         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "...to %02x:%02x:%02x.%02x\n",
 170                           data->id.segment, data->id.bus, data->id.device,
 171                           data->id.function));
 172
 173         /*
 174          * TBD: Support slot devices (e.g. function=0xFFFF).
 175          */
 176
 177         /*
 178          * Locate PCI Device
 179          * -----------------
 180          * Locate matching device in PCI namespace.  If it doesn't exist
 181          * this typically means that the device isn't currently inserted
 182          * (e.g. docking station, port replicator, etc.).
 183          * We cannot simply search the global pci device list, since
 184          * PCI devices are added to the global pci list when the root
 185          * bridge start ops are run, which may not have happened yet.
 186          */
 187         bus = pci_find_bus(data->id.segment, data->id.bus);
 188         if (bus) {
 189                 list_for_each_entry(dev, &bus->devices, bus_list) {
 190                         if (dev->devfn == PCI_DEVFN(data->id.device,
 191                                                     data->id.function)) {
 192                                 data->dev = dev;
 193                                 break;
 194                         }
 195                 }
 196         }
 197         if (!data->dev) {
 198                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 199                                   "Device %02x:%02x:%02x.%02x not present in PCI namespace\n",
 200                                   data->id.segment, data->id.bus,
 201                                   data->id.device, data->id.function));
 202                 result = -ENODEV;
 203                 goto end;
 204         }
 205         if (!data->dev->bus) {
 206                 printk(KERN_ERR PREFIX
 207                             "Device %02x:%02x:%02x.%02x has invalid 'bus' field\n",
 208                             data->id.segment, data->id.bus,
 209                             data->id.device, data->id.function);
 210                 result = -ENODEV;
 211                 goto end;
 212         }
 213
 214         /*
 215          * PCI Bridge?
 216          * -----------
 217          * If so, set the 'bus' field and install the 'bind' function to
 218          * facilitate callbacks for all of its children.
 219          */
 220         if (data->dev->subordinate) {
 221                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 222                                   "Device %02x:%02x:%02x.%02x is a PCI bridge\n",
 223                                   data->id.segment, data->id.bus,
 224                                   data->id.device, data->id.function));
 225                 data->bus = data->dev->subordinate;
 226                 device->ops.bind = acpi_pci_bind;
 227                 device->ops.unbind = acpi_pci_unbind;
 228         }
 229
 230         /*
 231          * Attach ACPI-PCI Context
 232          * -----------------------
 233          * Thus binding the ACPI and PCI devices.
 234          */
 235         status = acpi_attach_data(device->handle, acpi_pci_data_handler, data);
 236         if (ACPI_FAILURE(status)) {
 237                 ACPI_EXCEPTION((AE_INFO, status,
 238                                 "Unable to attach ACPI-PCI context to device %s",
 239                                 acpi_device_bid(device)));
 240                 result = -ENODEV;
 241                 goto end;
 242         }
 243
 244         /*
 245          * PCI Routing Table
 246          * -----------------
 247          * Evaluate and parse _PRT, if exists.  This code is independent of
 248          * PCI bridges (above) to allow parsing of _PRT objects within the
 249          * scope of non-bridge devices.  Note that _PRTs within the scope of
 250          * a PCI bridge assume the bridge's subordinate bus number.
 251          *
 252          * TBD: Can _PRTs exist within the scope of non-bridge PCI devices?
 253          */
 254         status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
 255         if (ACPI_SUCCESS(status)) {
 256                 if (data->bus)  /* PCI-PCI bridge */
 257                         acpi_pci_irq_add_prt(device->handle, data->id.segment,
 258                                              data->bus->number);
 259                 else            /* non-bridge PCI device */
 260                         acpi_pci_irq_add_prt(device->handle, data->id.segment,
 261                                              data->id.bus);
 262         }
 263
 264       end:
 265         kfree(pathname);
 266         if (result)
 267                 kfree(data);
 268
 269         return result;
 270 }
 271
 272 static int acpi_pci_unbind(struct acpi_device *device)
 273 {
 274         int result = 0;
 275         acpi_status status = AE_OK;
 276         struct acpi_pci_data *data = NULL;
 277         char *pathname = NULL;
 278         struct acpi_buffer buffer = { 0, NULL };
 279
 280
 281         if (!device || !device->parent)
 282                 return -EINVAL;
 283
 284         pathname = kzalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
 285         if (!pathname)
 286                 return -ENOMEM;
 287
 288         buffer.length = ACPI_PATHNAME_MAX;
 289         buffer.pointer = pathname;
 290         acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
 291         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Unbinding PCI device [%s]...\n",
 292                           pathname));
 293         kfree(pathname);
 294
 295         status =
 296             acpi_get_data(device->handle, acpi_pci_data_handler,
 297                           (void **)&data);
 298         if (ACPI_FAILURE(status)) {
 299                 result = -ENODEV;
 300                 goto end;
 301         }
 302
 303         status = acpi_detach_data(device->handle, acpi_pci_data_handler);
 304         if (ACPI_FAILURE(status)) {
 305                 ACPI_EXCEPTION((AE_INFO, status,
 306                                 "Unable to detach data from device %s",
 307                                 acpi_device_bid(device)));
 308                 result = -ENODEV;
 309                 goto end;
 310         }
 311         if (data->dev->subordinate) {
 312                 acpi_pci_irq_del_prt(data->id.segment, data->bus->number);
 313         }
 314         kfree(data);
 315
 316       end:
 317         return result;
 318 }
 319
 320 int
 321 acpi_pci_bind_root(struct acpi_device *device,
 322                    struct acpi_pci_id *id, struct pci_bus *bus)
 323 {
 324         int result = 0;
 325         acpi_status status = AE_OK;
 326         struct acpi_pci_data *data = NULL;
 327         char *pathname = NULL;
 328         struct acpi_buffer buffer = { 0, NULL };
 329
 330         pathname = kzalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
 331         if (!pathname)
 332                 return -ENOMEM;
 333
 334         buffer.length = ACPI_PATHNAME_MAX;
 335         buffer.pointer = pathname;
 336
 337         if (!device || !id || !bus) {
 338                 kfree(pathname);
 339                 return -EINVAL;
 340         }
 341
 342         data = kzalloc(sizeof(struct acpi_pci_data), GFP_KERNEL);
 343         if (!data) {
 344                 kfree(pathname);
 345                 return -ENOMEM;
 346         }
 347
 348         data->id = *id;
 349         data->bus = bus;
 350         device->ops.bind = acpi_pci_bind;
 351         device->ops.unbind = acpi_pci_unbind;
 352
 353         acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
 354
 355         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Binding PCI root bridge [%s] to "
 356                           "%02x:%02x\n", pathname, id->segment, id->bus));
 357
 358         status = acpi_attach_data(device->handle, acpi_pci_data_handler, data);
 359         if (ACPI_FAILURE(status)) {
 360                 ACPI_EXCEPTION((AE_INFO, status,
 361                                 "Unable to attach ACPI-PCI context to device %s",
 362                                 pathname));
 363                 result = -ENODEV;
 364                 goto end;
 365         }
 366
 367       end:
 368         kfree(pathname);
 369         if (result != 0)
 370                 kfree(data);
 371
 372         return result;
 373 }